OCPBUGS-53312: [release-4.18] 🐛 fix crdupgradesafety diff when items schema differ (#1863)

[joelanford]

• crdupgradesafety: original copies from kapp
• crdupgradesafety: drop kapp dependency
• crdupgradesafety: remove unused code
• crdupgradesafety: fixup apiextensionsv1 import aliases
• crdupgradesafety: fix to ignore diffs in child items

Manual cherry-pick of 7061d92

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[openshift-ci-robot]

@joelanford: This pull request references Jira Issue OCPBUGS-53312, which is invalid:

• expected the bug to target the "4.18.z" version, but no target version was set
• release note text must be set and not match the template OR release note type must be set to "Release Note Not Required". For more information you can reference the OpenShift Bug Process.
• expected dependent Jira Issue OCPBUGS-53019 to be in one of the following states: VERIFIED, RELEASE PENDING, CLOSED (ERRATA), CLOSED (CURRENT RELEASE), CLOSED (DONE), CLOSED (DONE-ERRATA), but it is MODIFIED instead
• expected dependent Jira Issue OCPBUGS-53019 to target a version in 4.19.0, but no target version was set

Comment /jira refresh to re-evaluate validity if changes to the Jira bug are made, or edit the title of this pull request to link to a different bug.

The bug has been updated to refer to the pull request using the external bug tracker.

In response to this:

• crdupgradesafety: original copies from kapp
• crdupgradesafety: drop kapp dependency
• crdupgradesafety: remove unused code
• crdupgradesafety: fixup apiextensionsv1 import aliases
• crdupgradesafety: fix to ignore diffs in child items

Manual cherry-pick of 7061d92

---

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[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: joelanford

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[joelanford]

/jira refresh

[openshift-ci-robot]

@joelanford: This pull request references Jira Issue OCPBUGS-53312, which is invalid:

• expected dependent Jira Issue OCPBUGS-53019 to be in one of the following states: VERIFIED, RELEASE PENDING, CLOSED (ERRATA), CLOSED (CURRENT RELEASE), CLOSED (DONE), CLOSED (DONE-ERRATA), but it is MODIFIED instead

Comment /jira refresh to re-evaluate validity if changes to the Jira bug are made, or edit the title of this pull request to link to a different bug.

In response to this:

/jira refresh

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[openshift-ci]

@joelanford: all tests passed!

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[jianzhangbjz]

https://issues.redhat.com/browse/OCPBUGS-53019 failed ON_QA, hold this PR.
/hold